[Freeswitch-users] set variable at te chatplan with Lua

Hi In dialplan i can set veriable via session:execute ("set",<do what i need>) or session:setVariable (<varname>,<var value>) In chat plan exists only "set" application but in can not bee executed via message (analog of session) how to set variables here? I tried to use api:chat({<variables setup>} proto|sender|receiver|message) But it is does not work I exepted because of chat function description but tried anywhay.